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US2497431A
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Critical speed indicator
Assignee: Lockheed Martin Corp
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Filing: 1944-09-08
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Granted: 1950-02-14
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Expires: 1964-09-08
Abstract
No abstract record available.
Inventors
- 👤 Ward W Beman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:48
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/14; G01P5/16; G01P5/17; G01P5/175; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1296947A
Cited
FR494916A
Cited
US1433536A
Cited
FR591646A
Cited
GB274082A
Cited
US2011517A
Cited
US2279615A
Cited
US2272664A
Cited
US2176817A
Cited
US2309015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |